[This post will be updated frequently]
Building off the stellar quality of the a7S, the a7S II has better internal processing to handle shooting 4K up to 30fps straight to the SD cards. Another first for this series, the a7S II is capable of shooting 120fps at 1080p. While the other internal 4K Sony camera, the a7R II, has fantastic image quality, it's not nearly as good in low-light as the a7S, and that's really where the a7S II is going to stand out, especially now that you no longer need a 4K recorder. The a7S II is going to come in at $3,000, and should be available this fall.